Malicious PDF — malware analysis report

Static analysis result for SHA-256 be435fd9dea6765c…

MALICIOUS

PDF

107.9 KB Created: 2021-08-25 15:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1fbdd37ce25c05e1af477913ee603b46 SHA-1: 0ab16d1d9b44039f3829463e5da3b7a37f71dd2c SHA-256: be435fd9dea6765cbe703b1be15d5cb5c019d038014d0428530c3dc091d5f6f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of these links and the compromised hosting indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=drastic+measure+meaning PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dfc9856b717d01176c09bbe6303112a6/19358639372.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/11i7vhmc7gmn89bb3jp14chphl/31586174022.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/2983746524.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5c8543e9fe80adf2474ef0de2df41f7/xoluranezokowudoxofuriba.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125e145a6d0d---15975124944.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/43019667276.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/gefegeloxukajaluvavoro.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/attsce7hqeutkan7rpbeur9i46/vuseditifilexuf.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/174a326e2ce8f64eb4a4ca40ba09543e/4699772783.pdfIn PDF document text
    • http://nprofit.hk/userfiles/makakesapadigiwifateno.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/99f25a1918afd14aa4982ea121415620/95054991589.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8abd61daa3b596740cb1da5e4357bec9/bowuvar.pdfIn PDF document text
    • https://srmresidences.com/images/bulk_images/files/2927449560.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/74024199825.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3f82f1a6---nulurulaliwimazaxojolumu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-19/20210619025543984286.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/be23bbf1ababa6e400f9c3d1024492c7/mekajeborudonusiwumevexa.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/67783986098.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/20731850130.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983f36bec12---93751163402.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/831ef47b6bcee969737743fabfcd5ec3/matubowozuwatelixobinipu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/gts404l76ej241a4s49sj33nm3/14736507860.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11070 26284 bytes
SHA-256: 7a965d13b363fdabfa1e1d9be21702793bea9a68889273e76e819532c8b7a5fa
font_00_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 19048 bytes
SHA-256: 30694eb36c92ca9509354512442a7834d749426574a08729be600686b0ccf278
font_02_sfnt_off00013f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15723 18652 bytes
SHA-256: b778a8858e569a1d125e31f4ad3038591d63b9c327988ba3112f896794880584
font_04_sfnt_off000187a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A5 10508 bytes
SHA-256: cf0ba765a88bd5b2cbddfc19cf9a8ff463a9acf4ed7ffa61ae7531dd39f046cf

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